MAX6803, MAX6804, MAX6805 4-Pin, Low-Power µP Reset Circuits with Manual Reset

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The MAX6803/MAX6804/MAX6805 microprocessor (µP) supervisory circuits monitor the power supplies in 2.85V to 5.0V µP and digital systems. They increase circuit reliability and reduce cost by eliminating external components and adjustments. They also feature a debounced manual reset input.

These devices perform a single function: they assert a reset signal whenever the V_CC supply voltage declines below a preset threshold or whenever manual reset is asserted. Reset remains asserted for a preset timeout period after V_CC has risen above the reset threshold or after manual reset is deasserted. The only difference among the three devices is their output. The MAX6804 (push/pull) and MAX6805 (open-drain) have an active-low RESET output, while the MAX6803 (push/pull) has an active-high RESET output. The MAX6803/MAX6804 are guaranteed to be in the correct state for V_CC down to 0.7V. The MAX6805 is guaranteed to be in the correct state for V_CC down to 1.0V.

The reset comparator in these ICs is designed to ignore fast transients on V_CC. Reset thresholds are factory-trimmable between 2.63V and 4.80V, in approximately 100mV increments. These devices are available with a 1ms min, 20ms min, or 100ms min reset timeout period. Ideal for space-critical applications, the MAX6803/MAX6804/MAX6805 come packaged in a 4-pin SOT143. For a lower threshold voltage version, see the MAX6335/MAX6336/MAX6337.

Key Features

Applications/Uses

Ultra-Low 0.7V Operating Supply Voltage
Low 4.0µA Supply Current
Precision Monitoring of 2.85V to 5.0V Power-Supply Voltages
Reset Thresholds Available from 2.63V to 4.80V, in Approximately 100mV Increments
Debounced Manual Reset Input
Fully Specified over Temperature
Three Power-On Reset Timeout Periods Available (1ms min, 20ms min, 100ms min)
Low Cost
Three Available Output Structures: Push/Pull active-low RESET, Push/Pull RESET, Open-Drain active-low RESET
Guaranteed RESET/active-low RESET Valid to V_CC = 0.7V (MAX6803/MAX6804)
Power-Supply Transient Immunity
No External Components Required
4-Pin SOT143 Package
Pin Compatible with MAX811/MAX812 and MAX6314/MAX6315

	Automotive Electronics
	Computers: Desktop, Workstation, Server
	Controllers
	Critical µP and µC Power Monitoring
	Intelligent Instruments
	Portable Battery-Powered Equipment

Key Specifications: Supervisors (1 Monitored Voltage)

Part Number

Reset Threshold Range (V)

Active-Low Reset Output

Active-High Reset Output

Min. Reset Timeout Range

Watchdog Feature

Supervisor Features

Max. I_CC (µA)

RoHS Available

Industry Qualified

Package

Smallest Available Package (max w/pins) (mm²)

Operating Temp. Range (°C)

Price^**

MAX6803

2.5 to 3.3
3.3 to 5.5

Push-Pull

15ms to 85ms
1ms to 15ms
85ms to 300ms

No Watchdog

Manual Reset

Yes

Automotive - General

SOT-143/4

-40 to +125
-40 to +85
0 to +70

$0.98 @ 1k

MAX6804

Push-Pull

Automotive - General

$0.98 @ 1k

MAX6805

Open Drain

$0.98 @ 1k

See All Supervisors (1 Monitored Voltage) (268)

Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.